So had a few issues with my FD fitted a microtech system and seems to be fine just one question it is a std set of twins on the vehicle and a HKS induction system the car is idling at 1050/1150 rpm on idle and when decelerating it lunges as if running against throttle shouldn't a std motor run at 1800 rpm and if they do what do I need to do to sort it out

 

It sounds like the idle needs to be adjusted, vacuum leaks fixed, and the car tuned.